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semen quality : ウィキペディア英語版 | semen quality Semen quality is a measure of the ability of semen to accomplish fertilization. Thus, it is a measure of fertility in a man. It is the sperm in the semen that are of importance, and therefore semen quality involves both sperm quantity and quality. Decreased semen quality is a major factor of male infertility. ==General decline== There has been evidence for a general decline in sperm counts in Europe and the USA between 1938 and 1990. While these dates were critiqued, further analysis supported the findings. The reason(s) for the decline are unknown.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「semen quality」の詳細全文を読む
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